Device for removing external circular fins from pipe joints

Abstract

A device for removing external circular fins from pipe joints comprising a base, a hollow rotor with a faceplate mounted in the base, carriages located on the rotor faceplate, a mechanism for radial traverse of the carriages, having a holder rotatably fitted on the rotor, and a drive for the rotor and the mechanism for traversing the carriages. Each of the carriages is provided with a roller adapted to trace over the surface of the pipes being treated, while the mechanism for radial traverse of the carriages is composed of links with one of their ends articulated to the holder and with the other end to slide blocks, each of which is housed in a bore in the respective carriage with the possibility of radial movement therein and is connected to a spring gauged for the cutting force, the other end of which spring thrusts against the bottom of the carriage bore. The drive of the rotor and of the carriage traversing mechanism has two output shafts, of which one is kinematically associated with the rotor, while the other shaft is kinematically associated with the holder, which drive is provided with a mechanism for program control of the difference between the rotational speeds of the shafts.

What is claimed is: 
     
       1. A device for removing external circular fins from pipe joints made by resistance butt welding, comprising: a base; a hollow rotor mounted in said base; a faceplate mounted on said rotor; carriages mounted on said faceplate, each of said carriages having a bore; a roller secured to each of said carriages and adapted to trace over the surface of the pipes under treatment; a holder fitted on said rotor rotatably therearound; springs gauged for the cutting force having one of their ends thrusting against the bottom of the bore in each said respective carriage; slide blocks, each housed in the bore of said respective carriage and adapted for radial movement and with one end interconnected with the other end of said spring; means for effecting radial traverse of said carriages including links having one of their ends articulated to said holder and the other of their ends articulated to said slide blocks; means for driving the rotor and the carriage radial traversing means including an output shaft of said driving means for driving the rotor and for actuating the carriage radial traversing means kinematically associated with said rotor; another output shaft of said driving means for driving the holder and for actuating the carriage radial traversing mechanism kinematically associated with said holder; said driving means further including means for control of the difference between the rotational speeds of said output shafts for driving the rotor and the carriage radial traversing means. 
     
     
       2. A device as claimed in claim 1, wherein the means for control of the difference between the rotational speeds of the shaft kinematically associated with the rotor and with the holder, respectively comprises a differential drive interconnecting said shafts including a housing having internal-and-external rim gears loosely rotatable around the shaft kinematically associated with the holder, the external rim gear of said housing being in mesh with a gear set on the shaft kinematically associated with the rotor, while the internal rim gear thereof meshes, through planet pinions, with a sun gear of said differential drive set on the shaft kinematically associated with the holder, a pinion carrier essentially comprising a gear loosely rotatable around the shaft kinematically associated with the holder, and a rim gear on said pinion carrier is in mesh with a rack interconnected with the piston of a hydraulic cylinder which controls the traverse of the carriages.